"Watermelon Sugar" is the second single to be shared from Styles' forthcoming Fine Line album, after last month's lead single "Lights Up".
The new single is also the second track to be featured on his new LP. Fans guessed the track title after Styles posted on Twitter last month, "Kiwi walked so Watermelon Sugar could run."
Styles' new offering was released shortly after the singer/songwriter hosted an episode of Saturday Night Live, in which he debuted the new track.
Fine Line will follow on from Styles' 2017 self-titled debut album.
Back in August Styles revealed that his second album is about "having sex and feeling sad", and added that he did "a lot of mushrooms" while in Malibu's Shangri-La studios.
